Starting problem electrical

[Juice3]

I turn the key to start the car and the starter engages for a split second then stops and lights go dim on the dash but if i turn the key back to off position and wait about 10 seconds and try again it starts fine also sometimes it loses all power completely like battery disconnected so i wiggle the terminals a bit then it has power again? terminals are tight and no corossion and battery fully charged

 

[Not_An_Abba_Fan]

You answered your own question, wiggling the terminals will fix it, so I would be pulling the terminals off and making sure they are actually clean and refitting them making sure they are tight as well as any other wires going to them.

 

[rambunctious]

Agree with ABBa, need a clean so do them properly with emery cloth or sand paper, both the battery terminals and inside the clamps on the leads, make em shine.
You can buy a special wire brush cleaner if you want.
https://www.sparesbox.com.au/part/b...erm=4579328490979559&utm_content=ALL Products

 

[delcowizzid]

If the bcm doesn't recognise the key or its not making good contact with the ring around the ignition barrel you'll also get a momentary crank

 

[devilly]

I found with mine it was the connectors to the terminals that needed to be tightened up or cleaned, I used a mini vice on some of mine worked really well, Check your earths to the body as well.

 

[oska]

might be your starter motor is on its way out

does it happen when the engine is hot ?

 

[Juice3]

might be your starter motor is on its way out

does it happen when the engine is hot ?

Yeah only seems to happen when hot also is it normal for the starting to be irregular? sometimes its a really nice crisp instant start other times it needs to crank for 2 seconds or it starts instant but it's not that nice crisp start

 

[oska]

excluding any loose connections and, if it happens mainly when the engine is hot then i really think it's the starter motor drawing huge amounts of amps when starting causing the voltage drop

it's an easy fix to replace

 

[KustomKulture62]

You need to go buy a battery termal cleaner tool, I bought mine 30 years ago and been used rarely but a tool worth having.

 

[fxxxrr]

My old VT had this issue when hot as well, turned out to be starter motor, would crank ok cold but hot it wouldnt start a lot of the time, same symptoms as flat or dud battery, put a new starter in it and it cranked like it had 2 batteries connected never missed again afterwards